JPH0437994B2 - - Google Patents
Info
- Publication number
- JPH0437994B2 JPH0437994B2 JP58243950A JP24395083A JPH0437994B2 JP H0437994 B2 JPH0437994 B2 JP H0437994B2 JP 58243950 A JP58243950 A JP 58243950A JP 24395083 A JP24395083 A JP 24395083A JP H0437994 B2 JPH0437994 B2 JP H0437994B2
- Authority
- JP
- Japan
- Prior art keywords
- sheet
- sound
- dense
- sound absorbing
- absorbing material
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- 239000011358 absorbing material Substances 0.000 claims description 42
- 238000010521 absorption reaction Methods 0.000 description 30
- 230000000694 effects Effects 0.000 description 24
- 239000010410 layer Substances 0.000 description 11
- 239000012528 membrane Substances 0.000 description 11
- 239000000463 material Substances 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 239000002356 single layer Substances 0.000 description 5
- 229920003023 plastic Polymers 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 2
- 229920002554 vinyl polymer Polymers 0.000 description 2
- 230000002238 attenuated effect Effects 0.000 description 1
- 238000005553 drilling Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002023 wood Substances 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
- B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/065—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
- B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
- B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
-
- G—PHYSICS
- G10—MUSICAL INSTRUMENTS; ACOUSTICS
- G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
- G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/16—Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
- G10K11/162—Selection of materials
- G10K11/168—Plural layers of different materials, e.g. sandwiches
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2307/00—Properties of the layers or laminate
- B32B2307/10—Properties of the layers or laminate having particular acoustical properties
- B32B2307/102—Insulating
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
- Y10T428/24322—Composite web or sheet
- Y10T428/24331—Composite web or sheet including nonapertured component
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Acoustics & Sound (AREA)
- Multimedia (AREA)
- Building Environments (AREA)
- Soundproofing, Sound Blocking, And Sound Damping (AREA)
- Laminated Bodies (AREA)
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、吸音材に係わり、特に広い周波数帯
域にわたつて高い吸音特性を必要とするコンピユ
ータ等の電子機器に好適な吸音材に関する。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a sound absorbing material, and particularly to a sound absorbing material suitable for electronic devices such as computers that require high sound absorbing properties over a wide frequency band.
従来の吸音材は、例えば発泡プラスチツク等の
一層の多孔シートから構成されたものが主として
用いられている。この一層の多孔シートからなる
吸音材の吸音性能は低周波では低く、周波数が高
くなるに従い高くなる特性を示す。もし、低周波
帯域での吸音効果を高めたい場合には多孔シート
の厚さを厚くするなどの方法をとつている。
Conventional sound absorbing materials are mainly composed of a single-layer porous sheet such as foamed plastic. The sound absorbing performance of the sound absorbing material made of this single-layer porous sheet is low at low frequencies, and increases as the frequency increases. If it is desired to increase the sound absorption effect in the low frequency band, methods such as increasing the thickness of the porous sheet are used.
しかし、一般には厚さは使用上から制限される
ことが多く無制限に厚くすることは許されない。 However, in general, the thickness is often limited from the viewpoint of use, and increasing the thickness without limit is not allowed.
さらに厚さを厚くすると吸音材の価格も増加す
るので、電子機器や家電品等の製品コストの増加
につながるなどの欠点がある。 Furthermore, increasing the thickness also increases the cost of the sound absorbing material, which has the disadvantage of increasing the cost of products such as electronic devices and home appliances.
また、この低周波数帯域での吸音性能を改善す
るために、実公昭52−32161号公報に記載のよう
に発泡プラスチツク等からなる多孔シートとビニ
ール樹脂等からなる緻密シートを交互に重ね合わ
せて吸音材を構成したものがある。この種の吸音
材では、低周波数帯域で、吸音特性が良いが、反
面高周波数帯域では、悪くなる欠点がある。高周
波数帯域での吸音効果を高めたい場合には、多孔
シートの厚さを厚くするなどの方法をとつてお
り、一層の吸音材と同様の欠点が生じるので、吸
音材の使用範囲が限られていた。 In addition, in order to improve the sound absorption performance in this low frequency band, as described in Japanese Utility Model Publication No. 52-32161, porous sheets made of foamed plastic etc. and dense sheets made of vinyl resin etc. are layered alternately to absorb sound. There are things that are made of wood. This type of sound-absorbing material has good sound-absorbing properties in a low frequency band, but has the disadvantage that it becomes poor in a high frequency band. If you want to increase the sound absorption effect in high frequency bands, methods such as increasing the thickness of the porous sheet are used, but this has the same drawbacks as single-layer sound absorption materials, so the range of use of sound absorption materials is limited. was.
上記の緻密シートと多孔シートを交互に重ね合
わせて構成した従来の吸音材の吸音特性は外表面
の第１層目の緻密シートの膜振動の共振に起因す
る吸音効果と次層目の緻密シートの膜振動に起因
する吸音効果の和になる。この膜振動の共振周波
数は緻密シートの膜とその背後の多孔シートによ
つて決定する。したがつて、緻密シートの第１層
目と次の２層目背後の多孔シートの厚さを変化さ
せると吸音特性が変化するので、音源の周波数特
性に合致した吸音材を得ることができる。
The sound-absorbing properties of the conventional sound-absorbing material, which is constructed by alternately stacking the above-mentioned dense sheets and porous sheets, are the sound-absorbing effect caused by the resonance of the membrane vibration of the first layer of the dense sheet on the outer surface, and the sound-absorbing effect of the second layer of the dense sheet on the outer surface. It is the sum of the sound absorption effects caused by membrane vibration. The resonance frequency of this membrane vibration is determined by the dense sheet membrane and the porous sheet behind it. Therefore, by changing the thickness of the porous sheet behind the first layer and the second layer of the dense sheet, the sound absorption properties change, so it is possible to obtain a sound absorption material that matches the frequency characteristics of the sound source.
この緻密シートの膜振動による共振周波数は通
常800Hz以下であるので、この種の吸音材は低周
波数帯域の騒音対策に限られる。 Since the resonant frequency due to membrane vibration of this dense sheet is usually 800Hz or less, this type of sound absorbing material is limited to noise countermeasures in the low frequency band.
これに対して、緻密シートと多孔シートからな
る１層の吸音材においては緻密シートに穴を開口
すると、その開口率に比例して緻密シートの穴を
通過する音のエネルギーは増大し、高周波数帯域
で多孔シートによる吸音効果が得られる。 On the other hand, in a single-layer sound absorbing material consisting of a dense sheet and a porous sheet, when holes are opened in the dense sheet, the energy of sound passing through the holes in the dense sheet increases in proportion to the opening ratio, resulting in high frequency A sound absorption effect can be obtained by the porous sheet in the zone.
しかし、緻密シートの膜振動による低周波数帯
域の吸音効果は穴の開口率を大きくすると急激に
低下し高周波数帯域に限られてしまうものであつ
た。従来はこのように低周波数帯域用の吸音材と
高周波数帯域用の吸音材があり、用途に応じて使
い分けていた。 However, the sound absorption effect in the low frequency band due to the membrane vibration of the dense sheet decreases rapidly when the aperture ratio of the holes is increased, and is limited to the high frequency band. In the past, there were sound absorbing materials for low frequency bands and sound absorbing materials for high frequency bands, and they were used depending on the application.
本発明の目的は、吸音材の厚さを変えることな
く、騒音源の周波数特性に則して低周波数帯域の
吸音特性を制御できるとともに、広い周波数帯域
において良好な吸音特性を有する吸音材を提供す
ることにある。 An object of the present invention is to provide a sound absorbing material that can control sound absorption characteristics in a low frequency band in accordance with the frequency characteristics of a noise source without changing the thickness of the sound absorbing material, and has good sound absorption characteristics in a wide frequency band. It's about doing.
上記目的は、緻密シートが外表面に位置するよ
うに複数枚の多孔シートと緻密シートを交互に重
ね合わせ、これらを密着し、前記外表面の緻密シ
ートに複数個の貫通穴をその穴の全面積がシート
面積に対して20％以内の範囲に設けて構成するこ
とにより、達成される。
The above purpose is to alternately stack a plurality of porous sheets and dense sheets so that the dense sheet is located on the outer surface, adhere them closely, and make a plurality of through holes in the dense sheet on the outer surface. This is achieved by arranging the area within 20% of the sheet area.
外表面に位置する緻密シートに設けた複数個の
貫通穴をその穴の全面積がシート面積に対して20
％以内の範囲に設けているので、外表面に位置す
る緻密シートを透過する音のエネルギーを増加さ
せて、多孔シートによる高周波数帯域の吸音効果
を増大させるとともに、外表面に位置する緻密シ
ートおよび特に２層目の緻密シートの膜振動によ
る吸音効果、すなわち、低周波数帯域での吸音効
果が開口に伴つて低下するが、２層目の緻密シー
トに到達する音のエネルギーは２層目の緻密シー
トの膜振動の吸音効果によつて減衰させることに
より低周波および高周波数帯域で吸音特性が良好
となる。
The total area of the multiple through holes provided in the dense sheet located on the outer surface is 20% of the sheet area.
%, it increases the sound energy that passes through the dense sheet located on the outer surface, increasing the sound absorption effect of the high frequency band by the porous sheet, and also increases the sound energy transmitted through the dense sheet located on the outer surface and In particular, the sound absorption effect of the second-layer dense sheet due to membrane vibration, that is, the sound-absorption effect in the low frequency band, decreases as the opening decreases, but the sound energy that reaches the second layer of dense sheet is absorbed by the second layer. By attenuating the membrane vibration of the sheet by the sound absorption effect, the sound absorption characteristics are improved in low frequency and high frequency bands.
この結果、広範囲の周波数帯域で良好な吸音特
性が得られる。しかも、多孔シートの厚さを変更
することによつて吸音効果が最大となる周波数域
に合わせることができるので、効果的な吸音材を
実現できる。 As a result, good sound absorption characteristics can be obtained in a wide frequency band. Moreover, by changing the thickness of the porous sheet, it is possible to match the frequency range in which the sound absorption effect is maximum, thereby realizing an effective sound absorption material.
なお、緻密シートの開口率を20％以上に大きく
すると、外表面に位置する１層目の緻密シートの
膜振動の吸音効果が急激に低減し、多孔シートの
厚さを変更させても上記吸音効果は低下する。 In addition, when the aperture ratio of the dense sheet is increased to 20% or more, the sound absorption effect of the membrane vibration of the first layer of dense sheet located on the outer surface decreases rapidly, and even if the thickness of the porous sheet is changed, the above sound absorption effectiveness decreases.
以下、図面により本発明による吸音材の実施例
について説明する。第１図は、本発明の吸音材の
実施例の断面図、第２図は、本発明の吸音材の実
施例の側壁の部分断面斜視図を示す。だい１ず、
だい２ずにおいて、１は多孔シートで、例えば発
泡プラスチツクのような吸音特性を有する材質の
もので形成されている。２は緻密シートで、例え
ばビニール樹脂のような材質のもので形成されて
いる。３は緻密シート２を貫通する１個またはそ
れ以上の穴４を有する緻密シートである。そし
て、多孔シート１および緻密シート２また３は全
板厚が制限された場合に、その板厚の範囲内で
個々の部材がそれぞれ複数枚交互に重ね合わされ
るようになつている。かかる構成により全板厚さ
を20mmに制限した場合の本発明による吸音材の音
の進行方向を矢印で示す。性能を比較すると次の
ようになるが、本発明の吸音材では、図中で示す
音の入射方向と異なる場合でも、本発明の効果は
得られる。
Hereinafter, embodiments of the sound absorbing material according to the present invention will be described with reference to the drawings. FIG. 1 is a sectional view of an embodiment of the sound absorbing material of the present invention, and FIG. 2 is a partially sectional perspective view of a side wall of the embodiment of the sound absorbing material of the present invention. First,
In item 2, numeral 1 is a porous sheet made of a material having sound absorbing properties, such as foamed plastic. 2 is a dense sheet made of a material such as vinyl resin. 3 is a dense sheet having one or more holes 4 passing through the dense sheet 2. When the total thickness of the porous sheet 1 and the dense sheet 2 or 3 is limited, a plurality of individual members are alternately stacked on each other within the range of the thickness. The arrows indicate the direction in which sound travels in the sound absorbing material according to the present invention when the total plate thickness is limited to 20 mm with this configuration. Comparison of performance is as follows. With the sound absorbing material of the present invention, the effects of the present invention can be obtained even when the direction of sound incidence differs from that shown in the figure.
本発明のように、厚さｔ（１−ｔ）＝４mmおよび
ｔ（１−２）＝14mmの多孔シート１とｔ（３−１）＝
１mmで１個またはそれ以上の貫通穴を有する緻密
シート３およびｔ（２−１）＝１mmの緻密シート２
とをそれぞれ第２図に示すように重ね合せて密着
した場合の特性と、同様に同一厚さの多孔シート
と緻密シート（貫通孔を有さない）とを重ね合せ
て密着させた従来の吸音材の特性とを示すと第３
図のようになる。図において、それぞれＡ（太い
実線）は、従来の一層の多孔シートの吸音材の特
性、Ｂ（細い実線）は、第２図に示す吸音材と同
一構成で、緻密シートに貫通穴を有さない従来の
吸音材の特性を示す。第３図に示す特性の吸音材
の全板厚は、いずれも20mm一定である。又、図に
示すＣの特性は、第１図、第２図に示す本発明の
吸音材で、緻密シート３に形成した１個またはそ
れ以上設けた穴の全面積が緻密シート３の面積の
約1/20の場合である。図から明らかなように、本
発明による吸音材は、その全板厚が従来と同一に
した場合において、従来の吸音材と異なり、低周
波数帯域から高周波数帯域の広い帯域にわたつて
垂直入射吸音率が大きいことがわかる。これは、
緻密シート３と多孔シート１の結合にともなう低
周波数帯域の性能向上の効果と多孔シート１その
ものの高周波数帯域の性能効果を、緻密シート３
に１個またはそれ以上の貫通穴４を設けたことに
より同時に兼ねそなえることができたものであ
る。この穴４の緻密シート３に占める面積比は、
20％以内の範囲であれば、本発明の効果が得られ
る。それ以上に穴をあけると低周波数帯域におけ
る性能が低下することは明確になつている。 As in the present invention, a porous sheet 1 with thickness t(1-t)=4 mm and t(1-2)=14 mm and t(3-1)=
Dense sheet 3 with one or more through holes of 1 mm and dense sheet 2 with t(2-1)=1 mm
as shown in Figure 2, and the characteristics of a conventional sound absorbing structure in which a porous sheet and a dense sheet (without through holes) of the same thickness are stacked and brought into close contact. The characteristics of the material are shown in the third
It will look like the figure. In the figures, A (thick solid line) indicates the characteristics of a conventional single-layer porous sheet sound absorbing material, and B (thin solid line) has the same structure as the sound absorbing material shown in Figure 2, but has a dense sheet with through holes. It exhibits characteristics that are not found in conventional sound absorbing materials. The total thickness of the sound absorbing materials having the characteristics shown in Figure 3 is constant at 20 mm. In addition, the characteristic of C shown in the figure is that in the sound absorbing material of the present invention shown in FIGS. 1 and 2, the total area of one or more holes formed in the dense sheet 3 is the area of the dense sheet 3. This is about 1/20 of the cases. As is clear from the figure, when the total thickness of the sound absorbing material is the same as that of the conventional one, unlike the conventional sound absorbing material, the sound absorbing material according to the present invention absorbs vertically incident sound over a wide range from the low frequency band to the high frequency band. It can be seen that the ratio is large. this is,
The performance improvement effect in the low frequency band due to the combination of the dense sheet 3 and the porous sheet 1 and the performance effect in the high frequency band of the porous sheet 1 itself are compared with the dense sheet 3.
By providing one or more through-holes 4 in both, it is possible to provide both functions at the same time. The area ratio of this hole 4 to the dense sheet 3 is:
If the ratio is within 20%, the effects of the present invention can be obtained. It has become clear that drilling holes beyond this will degrade performance in low frequency bands.
本発明の別の実施例を第４図に示す。図におい
て、１は多孔シート、３および５は緻密シートで
あり、それぞれの緻密シートに、１個またはそれ
以上の貫通穴４または６が設けられている。構成
は、第２図の吸音材と同一であるが、異なる点は
緻密シート５にも、緻密シート３と同様貫通穴６
を設けたことである。第１図の実施例と第４図の
実施例の吸音材の吸音性能を第５図に示す。緻密
シート３および５とも貫通穴の面積は、緻密シー
ト面積の約５％である。第５図のＤ（実線）は第
４図の本発明の吸音材の性能特性であり、Ｃ（破
線）は第１図の本発明の吸音材の性能特性で、い
ずれの吸音材の全板厚とも20mmである。いずれの
本発明の吸音材とも、低周波数から高周波数に至
る広い周波数帯域で、吸音特性が良いことがわか
る。第４図で示す実施例の吸音材性能は、第１図
で示す実施例の吸音材性能に比べて、低周波数で
多少悪いが800〜3000Hzの中間周波数帯域で良い
ことがわかる。 Another embodiment of the invention is shown in FIG. In the figure, 1 is a porous sheet, 3 and 5 are dense sheets, and each dense sheet is provided with one or more through holes 4 or 6. The structure is the same as that of the sound absorbing material shown in FIG. 2, but the difference is that the dense sheet 5 also has through holes 6 like the dense sheet 3.
This is because we have established the following. The sound absorption performance of the sound absorbing materials of the embodiment shown in FIG. 1 and the embodiment shown in FIG. 4 is shown in FIG. The area of the through holes in both dense sheets 3 and 5 is about 5% of the dense sheet area. D (solid line) in FIG. 5 is the performance characteristic of the sound absorbing material of the present invention shown in FIG. 4, and C (broken line) is the performance characteristic of the sound absorbing material of the present invention shown in FIG. Both thicknesses are 20mm. It can be seen that all of the sound absorbing materials of the present invention have good sound absorbing properties in a wide frequency band from low frequencies to high frequencies. It can be seen that the performance of the sound absorbing material of the example shown in FIG. 4 is somewhat worse at low frequencies than the performance of the sound absorbing material of the example shown in FIG. 1, but good in the intermediate frequency band of 800 to 3000 Hz.
なお、本発明はここに示した実施例に関して多
くの変形を有するものであり、ここに示した詳細
な記述は本発明の示例として限定されるものでは
ない。 It should be understood that the invention is subject to many variations with respect to the embodiments shown herein, and the detailed description provided herein is not intended to be limiting as an illustrative example of the invention.
本発明の吸音材では、緻密シートが外表面に位
置するように複数枚の多孔シートと緻密シートを
交互に重ね合わせ、これらを密着し、前記外表面
の緻密シートに複数個の貫通穴をその穴の全面積
がシート面積に対して20％以内の範囲に設けて構
成ししているので、外表面に位置する緻密シート
を透過する音のエネルギーを増加させて、多孔シ
ートによる高周波数帯域の吸音効果を増大させる
とともに、外表面に位置する緻密シートおよび特
に２層目の緻密シートの膜振動による吸音効果、
すなわち、低周波数帯域での吸音効果が開口に伴
つて低下するが、２層目の緻密シートに到達する
音のエネルギーは２層目の緻密シートの膜振動の
吸音効果によつて減衰させることができるので、
この結果、広範囲の周波数帯域で良好な吸音特性
が得られる。
In the sound absorbing material of the present invention, a plurality of porous sheets and a dense sheet are alternately stacked so that the dense sheet is located on the outer surface, and these are closely attached, and a plurality of through holes are formed in the dense sheet on the outer surface. Since the total area of the holes is within 20% of the sheet area, the sound energy that passes through the dense sheet located on the outer surface is increased, and the high frequency band generated by the porous sheet is increased. In addition to increasing the sound absorption effect, the sound absorption effect due to membrane vibration of the dense sheet located on the outer surface and especially the second layer of dense sheet,
In other words, the sound absorption effect in the low frequency band decreases with the opening, but the sound energy reaching the second layer of dense sheet can be attenuated by the sound absorption effect of the membrane vibration of the second layer of dense sheet. Because you can
As a result, good sound absorption characteristics can be obtained over a wide frequency band.
しかも、多孔シートの厚さを変更することによ
つて吸音効果が最大となる周波数域に合わせるこ
とができるので、効果的な吸音材を実現できるの
で、従来と同一の板厚にしてその吸音性が高ま
り、電子機器など音源から発生する騒音などの遮
断に有効に活用できる。 Moreover, by changing the thickness of the porous sheet, it is possible to match the frequency range where the sound absorption effect is maximum, making it possible to create an effective sound absorption material. It can be effectively used to block noise generated from sound sources such as electronic devices.
第１図は、本発明の吸音材の部分断面図、第２
図は、本発明の吸音材の側壁の部分断面斜視図、
第３図は、本発明の吸音材の特性比較図、第４図
は、本発明の吸音材の部分断面図、第５図は、従
来の吸音材および本発明の吸音材の特性比較図で
ある。
１……多孔シート、２，３，５……緻密シー
ト、４，６……貫通穴。
FIG. 1 is a partial sectional view of the sound absorbing material of the present invention, and FIG.
The figure is a partial cross-sectional perspective view of the side wall of the sound absorbing material of the present invention,
Figure 3 is a characteristic comparison diagram of the sound absorbing material of the present invention, Figure 4 is a partial sectional view of the sound absorbing material of the present invention, and Figure 5 is a characteristic comparison diagram of the conventional sound absorbing material and the sound absorbing material of the present invention. be. 1... Porous sheet, 2, 3, 5... Dense sheet, 4, 6... Through hole.
Claims (1)
の多孔シートと緻密シートを交互に重ね合わせ、
これらを密着し、前記外表面の緻密シートに複数
個の貫通穴をその穴の全面積がシート面積に対し
て20％以内の範囲に設けて構成したことを特徴と
する吸音材。 ２ 前記外表面以外の緻密シートにも複数個の貫
通穴を設けて構成したことを特徴とする特許請求
の範囲第１項に記載の吸音材。[Claims] 1. A plurality of porous sheets and dense sheets are alternately stacked so that the dense sheet is located on the outer surface,
A sound absorbing material characterized in that these are closely attached and a plurality of through holes are provided in the dense sheet on the outer surface so that the total area of the holes is within 20% of the sheet area. 2. The sound absorbing material according to claim 1, characterized in that a plurality of through holes are provided in the dense sheet other than the outer surface.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58243950A JPS60135997A (en) | 1983-12-26 | 1983-12-26 | Sound absorbing material |
| US06/685,113 US4559255A (en) | 1983-12-26 | 1984-12-21 | Acoustical absorbing material |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP58243950A JPS60135997A (en) | 1983-12-26 | 1983-12-26 | Sound absorbing material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS60135997A JPS60135997A (en) | 1985-07-19 |
| JPH0437994B2 true JPH0437994B2 (en) | 1992-06-23 |
Family
ID=17111443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP58243950A Granted JPS60135997A (en) | 1983-12-26 | 1983-12-26 | Sound absorbing material |
Country Status (2)
| Country | Link |
|---|---|
| US (1) | US4559255A (en) |
| JP (1) | JPS60135997A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018154865A1 (en) | 2017-02-27 | 2018-08-30 | 日東電工株式会社 | Sound-absorbing material |
| WO2018154864A1 (en) | 2017-02-27 | 2018-08-30 | 日東電工株式会社 | Sound-absorbing material |
Families Citing this family (24)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61214607A (en) * | 1985-03-20 | 1986-09-24 | Hitachi Ltd | Control voltage generating circuit |
| JPS61171100U (en) * | 1985-04-12 | 1986-10-23 | ||
| GB8603341D0 (en) * | 1986-02-11 | 1986-03-19 | Portapax Ltd | Foam sheet |
| US4781962A (en) * | 1986-09-09 | 1988-11-01 | Kimberly-Clark Corporation | Composite cover material for absorbent articles and the like |
| JPS6390459A (en) * | 1986-10-01 | 1988-04-21 | Honda Motor Co Ltd | Noise-proof structure for vehicle |
| JPH049899A (en) * | 1990-04-27 | 1992-01-14 | Nippon Tokushu Toryo Co Ltd | Sound insulator |
| CA2091288C (en) * | 1992-03-13 | 1995-11-28 | Toru Morimoto | Membranous-vibration sound absorbing materials |
| GB2295077B (en) * | 1994-08-30 | 1998-08-26 | Paul Martin Dean | Apparatus for supporting sound generating equipment |
| GB9705402D0 (en) * | 1996-12-04 | 1997-04-30 | Pritex Ltd | Apparatus for and method of attenuating acoustic energy |
| AU783624B2 (en) * | 2000-03-17 | 2005-11-17 | Fletcher Challenge Limited | Building Construction |
| FR2835955B1 (en) * | 2002-02-11 | 2004-07-16 | Sai Automotive Sommer Ind | SOUNDPROOFING ASSEMBLY AND PART COMPRISING A WALL COVERED BY SAID ASSEMBLY |
| KR20060111459A (en) * | 2003-10-31 | 2006-10-27 | 다우 글로벌 테크놀로지스 인크. | Sound insulating system |
| KR200410470Y1 (en) * | 2005-12-19 | 2006-03-09 | 정경호 | potable desk top computer |
| CN102057421B (en) * | 2008-04-14 | 2014-12-10 | 3M创新有限公司 | Multilayer sound absorbing sheet |
| WO2009131855A2 (en) * | 2008-04-22 | 2009-10-29 | 3M Innovative Properties Company | Hybrid sound absorbing sheet |
| US8573358B2 (en) * | 2008-05-22 | 2013-11-05 | 3M Innovative Properties Company | Multilayer sound absorbing structure comprising mesh layer |
| US20120262808A1 (en) * | 2011-04-18 | 2012-10-18 | Robert Baker | Multiple-layer radiation absorber |
| CN102820029B (en) * | 2012-08-24 | 2014-06-18 | 广州市泰力高复合材料有限公司 | Muffling structure |
| DE102013100271A1 (en) * | 2013-01-11 | 2014-07-17 | Miele & Cie. Kg | Hood |
| US9140004B2 (en) | 2013-01-23 | 2015-09-22 | Paul Hansen | Sound control system |
| JP6175789B2 (en) * | 2013-02-14 | 2017-08-09 | セイコーエプソン株式会社 | Sound absorber, electronic device |
| JP6754724B2 (en) * | 2017-06-26 | 2020-09-16 | ニチアス株式会社 | Soundproof coating and engine unit |
| US20210383784A1 (en) * | 2018-11-09 | 2021-12-09 | 3M Innovative Properties Company | Blanking panels including acoustic absorbing materials |
| WO2024190516A1 (en) * | 2023-03-15 | 2024-09-19 | 東レ株式会社 | Sound absorbing material |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5232161U (en) * | 1975-08-29 | 1977-03-07 | ||
| JPS5850500B2 (en) * | 1979-10-17 | 1983-11-10 | 株式会社東芝 | Generator cutoff device |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3126978A (en) * | 1964-03-31 | Acoustical and thermal insulation | ||
| FR1362035A (en) * | 1963-04-17 | 1964-05-29 | New composite material | |
| DE1625422A1 (en) * | 1967-10-06 | 1970-07-23 | Papierfabrik Gmbh | Heat / sound absorbing composite panel using plastic foam layers |
| US3870591A (en) * | 1972-06-27 | 1975-03-11 | Armstrong Cork Co | Dimensionally stable, flexible plastic surface coverings |
| JPS5850500U (en) * | 1981-09-30 | 1983-04-05 | 松下電工株式会社 | Sound insulation, sound absorption board |
-
1983
- 1983-12-26 JP JP58243950A patent/JPS60135997A/en active Granted
-
1984
- 1984-12-21 US US06/685,113 patent/US4559255A/en not_active Expired - Fee Related
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5232161U (en) * | 1975-08-29 | 1977-03-07 | ||
| JPS5850500B2 (en) * | 1979-10-17 | 1983-11-10 | 株式会社東芝 | Generator cutoff device |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018154865A1 (en) | 2017-02-27 | 2018-08-30 | 日東電工株式会社 | Sound-absorbing material |
| WO2018154864A1 (en) | 2017-02-27 | 2018-08-30 | 日東電工株式会社 | Sound-absorbing material |
Also Published As
| Publication number | Publication date |
|---|---|
| US4559255A (en) | 1985-12-17 |
| JPS60135997A (en) | 1985-07-19 |
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